Not seeing too much "Texan" flavor here. For starters, Texas's relationship with the Civil War was and is…complicated. Texas was "officially" with the South, but I live a few miles from a cemetery with a very old memorial for a father and son who fought on opposite sides of the war. Kind of gets back to the "Texas and the rest of the states" attitude we Texans tend to have. What you could do is make the reenactment one for a battle from the Texas Revolution or the Mexican–American War, favorites of local reenactment groups.

I'd loose the Red Cross and UN declarations of neutrality. White flags were the sign of non-combatants at that time, and the American Civil War and Mexican-American war were also wars that helped spawn ideas like "No, seriously. Medics are off-limits".

Moving SCP-X will result in this area being regularly replicated across the area of transformation. It is permanently daytime within the extradimensional space, and damage done to the landscape by non-SCP-X-A and B instances immediately reverts.

This part is a bit over-the-top, I'd suggest toning it down to a moving bubble centered on the guy. Still a problem, but in a more interesting, less destructive way.